package com.yangke.springcloud.service;

import cn.hutool.core.util.IdUtil;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.PathVariable;

import java.util.concurrent.TimeUnit;

/**
 * @author wyk
 * @create 2022--10--14:16
 */
@Service
public class PaymentService {
    public String paymentIofo_OK(Integer id){
        return "线程池:  "+Thread.currentThread().getName()+"  paymentInfo_OK,id:  "+id+"\t"+"O(∩_∩)O哈哈~";
    }

    /**
     * 运行超时的时候，就会执行paymentIofo_TIMEOUTHandler()方法，运行正常执行paymentIofo_TIMEOUT()方法
     *
     * 超时错误和运算异常都会执行“兜底”的方法paymentIofo_TIMEOUTHandler()
     * @param id
     * @return
     */
    @HystrixCommand(fallbackMethod = "paymentIofo_TIMEOUTHandler"/*指定善后方法名*/,commandProperties = {
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds",value = "5000")
    })
    public String paymentIofo_TIMEOUT(Integer id){
        int timeout = 3000;  //执行时间耗时5秒，而设定的允许时间为3秒，会发生超时，执行Hystrix的服务降级
//        int i = 10 / 0;   运算异常，也会执行降级
        try {
            TimeUnit.MILLISECONDS.sleep(timeout);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return "线程池:  "+Thread.currentThread().getName()+"  paymentInfo_OK,id:  "+id+"\t"+"O(∩_∩)O哈哈~"+"耗时（秒）："+timeout+"秒";
    }
    public String paymentIofo_TIMEOUTHandler(Integer id){
        return "线程池:  "+Thread.currentThread().getName()+"  8001系统繁忙或者运行报错，请稍后再试,id:  "+id+"\t"+"o(╥﹏╥)o";
    }

    //=====服务熔断
    //  也就是说，一秒内错误请求达到60%之后，就会执行服务熔断，
    //  快速返回错误的响应信息；当错误率逐渐下降之后，服务调用响应正常，就会返回调用链路
    @HystrixCommand(fallbackMethod = "paymentCircuitBreaker_fallback",commandProperties = {
            @HystrixProperty(name = "circuitBreaker.enabled",value = "true"),// 是否开启断路器
            @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold",value = "10"),// 请求次数
            @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds",value = "10000"), // 时间窗口期
            @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage",value = "60"),// 失败率达到多少后跳闸，

    })
    public String paymentCircuitBreaker(@PathVariable("id") Integer id) {
        if(id < 0) {
            throw new RuntimeException("******id 不能负数");
        }
        String serialNumber = IdUtil.simpleUUID();

        return Thread.currentThread().getName()+"\t"+"调用成功，流水号: " + serialNumber;
    }
    public String paymentCircuitBreaker_fallback(@PathVariable("id") Integer id) {
        return "id 不能负数，请稍后再试，/(ㄒoㄒ)/~~   id: " +id;
    }

}
